Sap flow dynamics of Populus alba L.×P.talassica plantation in arid desert area
A thermal dissipation probe (TDP) was used to measure the sap flow dynamics of Populus alba L.×P.talassica in the agricultural development zones of Karamay during July 1-25,2012.Soil mositure,total radiation (TR),air temperature,relative humidity,water vapor pressure deficit (VPD) and wind speed were measured at the same time.The results showed that:Diurnal variation of the sap flow displayed a single peaked curve on sunny days,while it displayed a multi-peaked curves on cloudy days.The average value of sap flow was 0.6059 L/h.Sap flow velocity per unit sapwood area was significantly correlated with TR,air temperature,and VPD and was negatively correlated with atmospheric relative humidity.The ranking of correlation coefficients was TR＞air temperature＞VPD＞relative humidity＞wind speed.Sapwood area and diameter at breast height (DBH) were significantly correlated (r=0.834),and the sap-flow velocity per unit sapwood area decreased with increasing stem diameter at breast height (DBH).
climatic factorsarid desert areaPopulus alba L.×P.talassicasap flow
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维普
